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A earns 20% of what B earns. B earns 60% of what C earns. If they together earn Rs. 12900 a month, then the difference between C and A's earnings is ______.
1. Rs. 2200
2. Rs. 6600
3. Rs. 3300
4. Rs. 24400

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Correct Answer - Option 2 : Rs. 6600

Given :

A earns 20% of what B earns. B earns 60% of what C earns and they together earn Rs. 12900 a month. 

Calculations :

Let the income of A, B and C be A, B and C respectively. 

A = 20% of B 

A/B = 1/5 

B = 60% of C 

B/C = 3/5 

So 

A ; B : C = 3 : 15 : 25 or 3x : 15x : 25x 

According to the question 

3x + 15x + 25x = 12900 

⇒ 43x = 12900 

⇒ x = 300 

Difference of A and C = 25x - 3x = 22x 

⇒ 22 × 300 

⇒ 6600 rupees 

∴ Option 2 will be the correct choice.

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